Dust-catcher



(No Model.) 3Sheets-Sheet 1.

O. G. ROLLINS.

DUST OATGHBR.

No. 311,036; Patented Jan. 20, 1885;

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' 0. G. ROLLINS.

DUST OATGHER.

No. 311,036 Patnted Jan. 20, 1885.

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UNITE ra'ras CHARLES G. ROLLINS, OF ll'llNNEAPOLlS, MINXESOTA.

DUST CATCHER.

SPECIFICATION forming part of Letters Patent Ho. 311,036, dated January 20, 1885.

Application filed June 9, lSS-l. (X model.)

nepiu and State of Minnesota, have invented certain new and useful Improvements in Dust- Catchers, of which the following isa specification, reference being had therein to the accompanying drawings.

My iiiventitln relates to improvements in that class of dust-collectors which are employed in mills for freeing the dust-laden air discharged from middlings-purifiers and other machines from the dust or solid particles which [5 it contains.

As dust-col'lecto rs are ordinarily constructed, the dust-laden air is sifted or strained through filler-cloths, which intercept the dust and per- ,Illlll the air to pass through. The meshes of 2 the filter-cloths become filled with dust, and

hence it becomes necessary to provide jarring or brushing devices for removing the dust from the cloth. Moreover, it is found impracticable to remove the dust by jarring or brushing theiilter-cloths while the air is passing through them, and hence it becomes necessary to provide devices for cutting oil the air current from all or part of the cloths while they are being cleaned.

0 The object of my invention is to provide a dust-collector which shall eifectuall y filter or strain the dust from the dust-laden air passed into the dust-collector, and to dispense with all.

devices for cleaning the air-strainers. By illtering or st-raining the air I mean passing it through a medium which, while it allows the air itself to pass through, intercepts the dust or fluff carried by the air and does not allow it to pass through such medium.

0 To this end n1 invention consists enerall 4. 7L:

4 a vertical longitudinal section of my machine.

Fig. 2 is a vertical cross-section of the same. Fig. 3 is pcrspect-ivcwiew of one of thedus'tcatchers 5 Figs. 1 and 5, modified arrangefinents of the same.

13 represents a suitable supporting-frame.

A" is a chamber of any suitable size and shape, 'with its inclosing-walls supported by the frame B.

N is aspout or pipe through which the dustlado'n air frointhc milling machinery is conducted into the chamber. The walls of the chamber A or'port-ions the1'e'of,are composed of metal plates A, preferably arranged as shown in Fi 2. These plates are provided with fine perforations O, which are usually formed by puncturing the metal, thereby leaving lips or flanges P, which, when the plates are in position, extend inwardly into the chamber. These perforations are very fine, the spaces between the edges of the lips being too small to allow the passage therethrough of the dust contained in the air introduccdinto the chamber, while permitting the escape of the air. The plates are preferably arranged in an upright position, and the dust which is intercepted bythe plates slides down over the smooth surfaces of the projecting lips and over the smooth surfaces of the plates tions should be as fine as the spaces between the lips are in the other case.

In Fig. 2 the metal plates are shown an ranged in pairs, being secured at their upper edges to the opposite sides oflongitudinal beams O,which are supported on the frame B.

The ends of the chamber are closed by verti cal walls B. Below the lower edges of the plates A the sides of the chamber are inclosed by suitable walls, 3*. The platesA form the side walls of the upper part of the chamber. Under the lower edges of the plates A are slanting boards. D- A sinall opening is left at the bottom between every two boards, and through this the dust falls into the spouts E,

which are mounted or supported upon a frame a 00 any suitable motor.

or series of bars, F. The frame F is suspended from the inner walls of the chamber by straps G,whicl1 leaves the frame free to oscillate.

H is a shaft which is 'journaled within the chamber, and carrying the cams or eccentrics 'I. Straps J, secured to the depending straps G, pass around the eccentrics I. K is a pulley keyed upon shaft ll, and adapted to receive power through belt L from As the shaft H is rotated a reciprocating motion is imparted to the spouts E, and thewlnst collected within said spouts is fed into the discharging-spouts M,

. through which the dust passes irom the charm ber.

l'prefer to form the perforations in the metal plates in a series of parallel rows extendingu across the plate, and to arrange the plates in the dust-collector withthe rows of perforations extending vertically, as shown in Fig. 1, so that there will be no obstruction to the downward movement of the dust intercepted 'by-the metal plates. The metal, plates are provided with perforations, which are narrow slits 'in the metal; but in some instances round perforations or punctures, as shown in Fig. 5, may be'used. I

In order to guard against the possibility of any dust escaping through the dust-collector, I'sometimes surround the chamber or a part of the walls thereof with other metal plates, as shown in Fig. 4; In this'figure I have shown three sets of plates arranged one over another, and'with the perforations of one plate opposite the unperforated portions of the contiguous plate or plates. with this arrangement, if any'of the dust should possibly get through the first plate,i't would be collected by the succeeding plate or plates. In some instances I locate the dust-collectorv immediately over a middlings-purifier,with the casing of the purifier communicating directly with the dustcatcher. 'I he dust and fluff carried up by the current of air passing through the middlings is intercepted'by the metal plates, while the air passes through the fine perforations in the plates. An instance of this arrangement is found in my Patent No. 308,099, November 18,

1884. The self-cleaning featurelofthe strainers is in this connection of especial; value.

In Fig. 2 the upright plates are shown as inclined slightly inward at the top, and this I consider the preferable arrangement; but the plates are in some instances'arranged vertically, as shown in Fig. 5.

Other devices than those here shown maybe used for removing the dust as it slides down from the metal plates.

- Any suitable forcing or induction: means may be used for conveying the dust-laden air from the purifiers or other milling machinery to the chamber of thedust-collector.

I claim as my invention- 1. The combination, in a dust-collector, of

.for conducting dust-laden air to the air-strainers, whereby the air is passed through the perforations of the metal plates, while the dust is intercepted and collected below the strainers, all substantially as described.

2; The combination, in a dust-collector, of air-strainers composed of metalplates having therein a series of fine perforations provided with lips or flanges extending into the dustcollecting chamber, andmea-ns for conducting dustladen air to, the strainers, whereby the air is passedthrough the perforations of the metal plates,while the dust is intercepted and collected below the strainers, all substantially as described.

3rlhe combination, in a dust-collector, of air-strainers formed of metal plates having therein a series of fine perforations provided with lips or flanges extending into the dust collector, said perforations'being arranged in having therein a series of fine perforations,

means for conducting dust-laden air to the airstrainers, and conductors arranged under the.

upright strainers for conveying the dust from the dust-collector, substantially as described.

5. The combination, in a dust-collector, of a series of air-strainers, each composed of a metal plate having therein a series of fine perforations, said series of strainers being ar ranged with the perforations of each plate oppcsite the unperforated portions-of the next plate or plates, substantially as described,and

means for conducting dust-laden air to the strainers.

TOO

6. The combination, in a d'ust-collector,of

airstrainers consisting of metal plates provided with a series of fine perforations, and reciprocating spout or spouts for receiving the dust from the air-strainers and conveying it from the collector, substantially as set forth.

presence of two witnesses.

CHARLES G. ROLLIN S.

ITO

1 .In testimony whereof Iaflix mysigna-tu re 

